This is what Dylan Klebold wrote and drew in Eric Harris’ 1998 yearbook, a full year before Columbine, with key elements of the attack already planned.
Many of the phrases and ideas here come up repeatedly in his journal. Reading them together provides some context.
For example he’s all bravado here, because it’s for Eric’s consumption. But privately, he only thumps his chest this way for brief moments. In the journal, those bits are quickly followed by confessions that he doesn’t buy a word of it, and he quickly returns to disparaging himself.
Note: The first page is supposed to be cut off that way. Jeffco only scanned the bottom half, where Dylan had written.